Two transverse arcs form a bigon when subarcs between two consecutive intersection points together bound an embedded disc whose interior is disjoint from both arcs. Pushing one side across the disc removes the two corner intersections.

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  1. Essential proper arc on a punctured surface
  2. Mapping class group
  3. Topological surface
  4. Topology
  5. Geometry and topology
  6. Area of mathematics
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